Mexican Chicken Spaghetti

1 lb boneless, skinless chicken breasts
1 lb velveeta cheese, regular or mexican
1 can(s) rotel tomatoes, regular or hot
1 lb spaghetti pasta
1 stick butter
1 can(s) cream of chicken soup, undiluted
1 can(s) cream of mushroom soup, undiluted
1 medium onion, chopped
1 bell pepper, red or green, chopped
salt and pepper to taste

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